Stress Distribution during Rapid Canine Retraction with a Distraction Device: A Finite Element Study

Abstract

Objective : To evaluate stress patterns in the maxillary canine and first molar region during rapid canine retraction by a distraction device and determine the amount of force generated by 0.5 mm activation of the distractor device in the 3D model of maxillary arch using finite element analysis. Materials and methods: For the study, 40 slices of 0.625 mm sections at 0.2 mm intervals of spiral computed tomographic (CT) scan of the maxilla with permanent dentition was taken using GE 64 slicer spiral CT in helical mode using version 4.2 Application Development Workbench (ADW) software and was simulated with 0.5 mm activation of the distractor device. Results: The stress was greatest in the molar region which generated a force of 214 g within the range of orthodontic forces. Conclusion: The periodontium in the maxillary first molar region showed the maximum stress and the canine showed unequal stress distribution with more stress at the crest of the alveolar bone and lesser stress at the apical region which lessens root resorption.